I have a 2007 Dodge Ram 1500 SLT with the 4.7. The plugs for the 4.7 have a reach of 3/4". I believe my mechanic may have installed the plugs for the 5.7 hemi which are 1" in reach. My truck went into the shop perfectly fine and came out with the engine knocking. Is it possible that the 1/4" difference in length caused the pistons to strike the longer, incorrect plugs hence, that caused the knock? The shop admitted to me that the wrong plugs had been ordered. When asked if it was possible that they may have installed the incorrect ones, they told me that the thread size wasn't the same. Well, truth be told, it is the same size thread. Thanks for any input!

Asked by bluefish935 Mar 23, 2014 at 09:25 AM about the 2007 Dodge RAM 1500 SLT RWD

Question type: Maintenance & Repair

The plugs for the 4.7 have a reach of 3/4". I believe my mechanic may have installed
the plugs for the 5.7 hemi which are 1" in reach. My truck went into the shop perfectly
fine and came out with the engine knocking. Is it possible that the 1/4" difference in
length caused the pistons to strike the longer, incorrect plugs hence, that caused the
knock? The shop admitted to me that the wrong plugs had been ordered. When asked
if it was possible that they may have installed the incorrect ones, they told me that the
thread size wasn't the same. Well, truth be told, it is the same size thread. Thanks for
any input!

2 Answers
12,665

madmopar answered 10 years ago

yes, it is entirely possible. only way to know for sure is to tear it down.

1 people found this helpful.
Mark helpful
10

Fresh81 answered 10 years ago

Is it a knocking or a pinging sound, if the pistons struck the plugs it would not be running however incorrect reach will cause inadequate combustion thus causing the valves to chatter, have you replaced with the correct plugs?

Mark helpful

Your Answer:

Related Questions

Shortcuts

Search Dodge RAM 1500 Questions

CarGurus Experts

  • #1
    Dan Connell
    Reputation
    20,300
  • #2
    dandyoun
    Reputation
    15,300
  • #3
    Gene Arnett
    Reputation
    11,760
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
320 Great Deals out of 13,991 listings starting at $1,712
Used Chevrolet Silverado 1500
222 Great Deals out of 5,872 listings starting at $2,975
Used GMC Sierra 1500
132 Great Deals out of 6,515 listings starting at $3,975
Used Dodge RAM 2500
17 listings starting at $7,900
Used Toyota Tundra
30 Great Deals out of 1,367 listings starting at $6,255
Used Dodge Charger
39 Great Deals out of 727 listings starting at $5,995
Used Dodge Challenger
22 Great Deals out of 455 listings starting at $7,999
Used Dodge Durango
52 Great Deals out of 2,236 listings starting at $5,500
Used Toyota Tacoma
45 Great Deals out of 1,079 listings starting at $9,399
Used Jeep Grand Cherokee
113 Great Deals out of 3,142 listings starting at $3,995
Used Chevrolet Silverado 2500HD
28 Great Deals out of 1,243 listings starting at $9,500
Used Chevrolet Tahoe
11 Great Deals out of 891 listings starting at $12,900
Used Chevrolet Colorado
32 Great Deals out of 1,585 listings starting at $5,800
Used Dodge RAM 3500
28 listings starting at $13,888

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.